In the nematic state of FeSe, B1g Raman intensity is suppressed at low frequencies because the orbital content of the Fermi pockets becomes nearly mono-orbital, and charge-conservation vertex corrections cancel the resulting s-wave component of the Raman vertex.
Lifted electron pocket and reversed orbital occupancy imbalance in FeSe
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abstract
The FeSe nematic phase has been the focus of recent research on iron based superconductors (IBSs) due to its unique properties. A number of electronic structure studies were performed to find the origin of the phase. However, such attempts came out with conflicting results and caused additional controversies. Here, we report results from angle resolved photoemission and X-ray absorption spectroscopy studies on FeSe with detwinning by a piezo stack. We have fully resolved band dispersions with orbital characters near the Brillouin zone corner which reveals absence of a Fermi pocket at the Y point in the 1Fe Brillouin zone. In addition, the occupation imbalance between dxz and dyz orbitals is found to be opposite to that of iron pnictides, which is consistent with the identified band characters. These results settle down controversial issues in the FeSe nematic phase and shed light on the origin of nematic phases in IBSs.
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Raman response in the nematic phase of FeSe
In the nematic state of FeSe, B1g Raman intensity is suppressed at low frequencies because the orbital content of the Fermi pockets becomes nearly mono-orbital, and charge-conservation vertex corrections cancel the resulting s-wave component of the Raman vertex.